The Human Immune System - PowerPoint PPT Presentation

The Human Immune System. Lori Herrington Chaparral High School. What is immunology?. Very simply, it is the study of our body’s defense against infection and disease. Even though we are constantly bombarded by microorganisms, we rarely become sick. Why?. Why?.

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This occurs when damaged tissue and white blood cells (basophils), release histamine. Histamines, released from mast cells, cause the blood vessels to dilate allowing the tissue to become more permeable to tissue fluid.